@karthik1eee It comes with experience. You do some research and basically muddle your way through.
Msconfig, as shown in these videos, is a dormant configuration tool. It is not usual to see it's name unless you ran it, so in this instance you would block it.
@D3ATHBYFIR3 Thank you for calling me sir. I do appreciate it.
Read my reply again. I refuted nothing. I stated a fact. which was, that more than 3 gigs of RAM is not a sole reason to choose 64 bit.
Suppose you have 18 gigs of RAM, and you have an app you have to use, that isn't supported on 64...